Rucksack



FIG. 1 is a front elevational view of a rucksack showing my new design;

FIG. 2 is a rear elevational view thereof; and,

FIG. 3 is a right side elevational view thereof; the left side elevational view being a mirror image thereof.

The bottom is unornamented. The broken lines represent stitch lines. 

The ornemental design for a rucksack, as shown and described. 